We divide 646258 by 80
We want to figure out the number of times 646258 can be divided by 80.

On to step 1:
6 divided by 80 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 80

Let's proceed to step 2:
64 divided by 80 is 0 with a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Fetch the next digit (6) from the dividend, attach it to 64 and continue: 646 / 80

Let's proceed to step 3:
When dividing 646 by 80, we get 8 with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we subtract 640 from 646, we get 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 80

Going ahead to step 4:
The number 80 fits into 62 0 times, leaving a remainder of 62.
Record the quotient 0 as the next digit in the result. 
Result so far: 80.0
Subtracting 0 from 62 leaves us with 62.
Bring next digit (5) of the dividend behind the 62 and repeat the process: 625 / 80

Advancing to step 5:
The number 80 fits into 625 7 times, leaving a remainder of 65.
Use 7 as the next digit of our solution. 
Result so far: 807.0
If we take 560 away from 625, we end up with 65.
Take the next digit (8) from the dividend and append it to 65, then repeat: 658 / 80

Going ahead to step 6:
80 goes into 658 8 times with a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 8078.0
The remainder is 18 after subtracting 640 from 658.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 7:
When dividing 180 by 80, we get 2 with a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 8078.2
If we take 160 away from 180, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
80 goes into 200 2 times with a remainder of 40.
The number 2 becomes the next digit in our result. 
Result so far: 8078.22
Subtracting 160 from 200 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

After the division, we end up with 8078.22 and a remainder of 0.04.